Installation
Check out the GMTSAR github Wiki page for information about installation via Package Manager or installing from source on Mac, Linux, or Windows operating systems:
https://github.com/gmtsar/gmtsar/wiki/GMTSAR-Wiki-Page
Are you working with ERS or Envisat Data?
To download orbit files for ERS or Envisat satellite data visit:
http://topex.ucsd.edu/gmtsar/tar/ORBITS.tar
Then place them in /usr/local/ and untar them:
sudo -i cd /usr/local mkdir orbits cd orbits tar -xvf ~/Downloads/ORBITS.tar # (need full path to ORBITS.tar)